刷 LeetCode 题库时，出现如上报错，代码没问题，本地运行也没问题，可复制到 LeetCode 就报错。
解决方案：在函数的最后添加一条 return 语句，只要返回的类型对即可！（return 0 也行）。
切记：一定要返回，虽然永远也用不上。
参考 https://blog.csdn.net/FunnyZilly/article/details/87899960
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